Pump jack



0. CULLMAN.

PUMP'JAGK.

APPLIICATION man 050.21. 1921.

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PUMP JACK.

APPLXCATION FlLED DEC. 27, 1921- 1 ,4. 1 1 ,4 1-8 Patented Apr. 4, 1922.

2 SHEETS-SHEET 2.

UNITED STATES ATENT orrics.

OTTO GULLMAN, OF CHICAGO, ILLINOIS.

PUMP JACK.

To all whom it may concern:

Be it known that I, OTTO GULLMAN, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Pump Jacks, of which the following, reference being had to the drawings accompanying and forming a part hereof, is a specification.

This invention relates to pump jacks used for operating the pistons or rods of pumps.

Among the objects of this invention is to obtain a pump jack by means of which what is termed the peak of the load carried by saidjack will be lessened, that is, if the up and down travel of the pump rod is, say five inches, the load carried by Said jack will not exceed that of a pump rod travel of say three and one half inches, without lessening the time in which said pump rod will travel an up and down cycle; to obtain a pump jack by means Of which the downward travel of the pump rod will be accelerated and the upward t 'avel thereof will be retarded correspondingly; to obtain a pulnp jack of the kind named which is simple in construction, containing fewparts which are notliable to get out of order, or be broken; and to obtain a pump .jack which can be attached to the .tube of a pump and the strains resulting from the operation of the jack will notbe imparted to said pump tube.

In the drawings referred to Fig. l is a top plan view of the pump jack;

Fig. 2 is an end elevation thereof, and

Fig. .3 is a side elevation.

Fig. 4 is a side elevation, on an enlarged scale, of one of the crankarms of the pump jack. l

A reference letter applied to designate a given part indicates said part throughout the several figures of the drawings, wherever the same appear.

A represents a base, which is illustrated as consistingv of horizontal members a, a, and vertical members a, a, a and a-, all integral, preferably of cast metal, to obtain a rigid base, adapted to resist strains in different directions. Horizontal members (1,, a, are substantially parallel. and vertical members a, c and 0 are substantially parallel. lvleniber a is in a plane substantially at right angles to the planes of the. remaining members of the base, and is illustrated as substantially tri angular in shape, its purpose being to re- Specification of Letters Patent.

Patented Apr, 4, 1922.

Application filed December 27, 1921 Serial No. 525,064.

are interposed between member 64 and pump tube C, and are preferably integral with said member a. D represents a gear box, (Z, d, hOIIZOHl fll flanges and d a vertical flange at the bottom of said gear box, and d, d bolts whichextend through apertures providedtherefor in flanges at, (Z, (Z, and into members aand a, respectively, to rigidly secure the gear box to the base. D, Fig. 3, represents shelf which is illus trated as integral with one side of gear box D, and on which a motor (X) is mounted to actuate the reducing gearing in said gear box. a E represents a journal hearing which 1s preferably integral with member a and is so illustrated in the drawings. F represents a shaft which is rotatably mounted in bearing E, and G, H, respectively represent crank arms rigidly mounted on shaft f. .I, i

I, represent pitmen which are pivotally mounted at the lower ends thereof, on crank arms G, H, by means ofpivots, or wrist pins J, J, and at the upper ends thereof to a cross bar which is attached to the pump rod or piston, in the ordinary Way. Said cross bar and the attaching of the piston thereto form no part of the invention and are not illustrated. I

The pivot J on crank arm H is extended beyond the pitman I, and roller K is rotatably mounted thereon. The shaft X. Of motor X extends into the gear box D, and reducing gear comprising driving chain L, sprocket wheel M on shaft on, pinion gear N rigidly mounted on'said shaft m, gear 0 rigidly mounted .on shaft n, said gear arranged to mesh with pinion N, is also contained in said gear box. P, P, respectively, represent the journal bearings of shafts m and n. rigidly secured on shaft is. Crank arm Q is provided with a recess or slot 9, and roller K on pivot J fits in said recess or slot, the sides of said recess forming runways for said roller in the operation of the pump, as here-, inafter described. Upon reference to Figs. 1 and 2 it will be observed, arm Q being the driving member of arm'H, shaft F and arm G, that while the shafts F and a are in sub Q represents a crank arm which is stantially the same horizontal plane, they are in different vertical planes, and thereby when the crank arms G, H, are in a horizontal plane, lifting the pitmen I. I, the roller K is adjacent to the inner end of slot g in crank arm Q, and when said arms Gr, H, and Q, have moved an angular distance of 180, into the same horizontal plane onthe downward movement of said pitmen, (said crank arms turning clockwise as viewed in Fig. 2), the ulley or roller K is at the extreme end of s 0t or recess 9, as is indicated by broken lines in said Fig. 2. By the above named relative positions of shafts F and n, on the upward movement of the pitmen I, 1, com mencing with crank arms G, H, and Q in substantially vertical ositions, as said arms are turned clockwise liy said crank arm Q, the roller K which is pivotally mounted on the pivot or wrist pin J of crank arm H, will travel inward, that is, towards shaft 4%, in slot g, until crank arms G and H are in a horizontal plane, at which time the peak of the load carried by said crank arms is imposed thereon, and at said time the load carried by crank arm Q; is determined by the distance from center to center of pivot or wrist pin J and shaft n. The travel of the center of said ivot J is indicated by the broken lines j, ig. 2, and the travel of the end of crank arm Q, is indicated by the broken line 9 in said Fig. 2. The travel of the inner end of slot 9 is indicated by the broken line 9. 7

Upon the turning of the several crank arms from the horizontal position illustrated by fulllines in Figs. 1 and 2, to substantially vertical position, the roller K will travel outward, (away from shaft n), in recess or groove g and the load carried by crank arms G, and H, will be correspondingly increased on crank arm Q. As, however, the said load on crank arms G and H decreases in said upward movement from horizontal to said substantially vertical positions, the load carried by crank arm Q decreases, being at no time so heavy as when said crank arms are horizontal.

In the continued angular travel from substantially vertical positions to horizontal position the roller K travels outward in slot or recess 9, thereby acceleratin the movement of'the crank'arms G and the load on said crank arms and on crank arm Q, being'increased by said acceleration, but at no time in the downward movement of the pitmen I, I, caused by said continued rotation of said crank arms is the load carried by crank arm Q so great as is carried by said arm when in a horizontal position on the lifting'of the pitmen, as above described.

By this construction the load carried by crank arm Q being lessened on the upward movement of the pitmen and increased on the downward movement of said pitmen,

with a given travel of said pitmen determined by crank arms G, H, which are of greater length than the distance from pivot or Wrist pins J, J to shaft n, on the u ward and load carrying movement of the ltmen, and of less distance on the downwar movement of said pitmen, the load carried b said-shaft n is to a certain extent, equalizer and a more uniform rotation thereof is obtained from motor X than would otherwise be secured. I find I am able to use a motor of less rated horse power than would otherwise be possible.

I claim:

1. In a pump jack, a base, means to secure said base to a pump tube, a shaft rotatably mounted on said base, crank arms on said shaft arranged to rotate therewith, wrist pins on said crank arms and pitmen, the lower ends thereof mounted on said wrist pins, in combination with a rotatably mounted driving shaft mounted on said base, in spaced horizontal relation with said first named shaft a crank arm on said driving shaft, one of said wrist pins extended and arranged to engage with said last named crank arm.

2. In a pump jack, a base provided with a vertical wall and with an additional vertical wall integral therewith and at right angles thereto, means comprising said first named vertical Wall to attach said base to a pump, a journal bearing on said first named vertical wall and a shaft rotatably mounted in said bearing, crank arms rigidly mounted on said shaft, wrist pins on said crank arms and pitmen mounted on said wrist pins, in combination with. a gear box rigidly mount ed on said base, a driving shaft journaled in said gear box in spaced horizontal relation to said first named shaft, an additional crank arm rigidly secured on said driving shaft, one of said wrist pins extending and a radially varying connection between said extended wrist pin and said additional crank arm.

3. In a pump jack, a base, a shaft rotatably mounted on said base, crank arms rigidly mounted on said shaft, wrist pins on said crank arms and pitmen mounted on said wrist pins, in combination with a rotatably mounted driving shaft positioned in spaced relation to said first named shaft, a crank arm rigidly secured to said driving shaft, one of said Wrist pins extended and a radially varying connection between said extended wrist pin and said crank arm on said driving shaft.

4:- In a. pump jack, a base, comprising horizontal and vertical walls integrally joined and an additional vertical wall integral with a vertical and a horizontal wall, a journal bearing integral with one of said verical. walls, a shaft rotatably mounted in said bearing, crank arms rigidly secured to said shaft, wrist pins on said crank arms and pitmen journalled on said wrist pins, in combination with a gear box rigidly secured on said base, a driving shaft journalled in said gear box, with one end thereof extending beyond one side of said gear box, a crank arm rigidly secured to said driving shaft, one of said wrist pins extended and a connection between said extended wrist pin and said last named crank arm, all arranged so that uniform rotation of said driving shaft and crank arm thereon drives said first named Crank arms and shaft, and retards the rotationthereof on the upward angular movement of the driven crank arms and accelerates the downward angular movement thereof.

5. In a pump jack, a base comprising vertical and horizontal Walls and an additional vertical Wall integral with and at substantially right angles to said first named Vertical and horizontal Walls, a journal bearing on said first named vertical wall, a shaft j ournalled in said bearing, crank arms rigidly mounted on said shaft, and Wrist pins on said crank arms, in combination with a gear box rigidly mounted on said base, a horizontal shelf on one side of said gear box, a motor on said shelf arranged with the shaft thereof eX- tending through one of the side Walls of said gear box, reducing gear in said box and a driven shaft of said reducing gear extendingthrough the other side of said box, in spaced relation to said first named shaft, a crank arm rigidly secured on said driven shaft, and one of said Wrist pins extended and a radially movable connection between said extended wrist pin and said last named crank arm.

OTTO CULLMAN.

Vitnesses Bnss BROWN, CHARLES TURNER BROWN. 

